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Cross-compiling is likely a better approach: https://github.com/tpoechtrager/osxcross

This is how Godot targets iOS: https://github.com/godotengine/build-containers/blob/main/Do...

Here's a Docker image with the tools preinstalled, though you'll need some tweaks to target iOS: https://github.com/shepherdjerred/macos-cross-compiler

While at RStudio (now called Posit), I worked on cross-compiling C/C++/Fortran/Rust on a Linux host targeting x86_64/aarch64 macOS. If you download an R package with native code from Posit Package Manager (https://p3m.dev/client/), it was cross-compiled using this approach :)

I did this. I had to share my USB port over Docker somehow (black magic I guess, instructions in the repo) and I was able to build iOS apps and run them on an iPhone.

What was the speed like?

For a basic Flutter app: tolerable

That would impressive if you could build for React Native iOS (with native Swift modules) and run it on a simulator in this on a Windows machine

At glacial speeds, indubitably.

you can! you can also run it on a real iOS device using this tech. it's explicitly documented in the repo :)